Warning: Your Navien boiler has detected a water flow sensor failure, which could lead to system damage if not addressed.
How to Fix Navien Code E205
Check if your boiler is making any unusual noises, which could indicate air in the system.
Try bleeding the air from the system using the built-in air vent.
If the issue persists, do not attempt to fix it yourself. Contact a professional HVAC technician.
How to Reset Navien Code E205
Turn off the unit using the power button on the front panel.
Turn off the gas supply valve.
Turn off the circuit breaker supplying power to the unit. Wait 30 seconds.
Restore power at the breaker, then open the gas valve.
Turn the unit back on. If the error returns, the underlying issue needs repair.
What does E205 mean?
The E205 error on your Navien boiler indicates a malfunction in the water flow sensor. This sensor is responsible for monitoring the water flow rate through your boiler. If it's not working correctly, your boiler may not heat water efficiently, leading to system issues. The most common causes for this error are a faulty sensor or air in the system.
Abnormal supply water-temp sensor operation for lower limit
This error occurs when the water temperature for supply or return does not operate properly. ● Turn off the furnace, turn it on again and check if the furnace operates properly. ● If the furnace is continuously inoperable, contact Technical Support at 1-800-519-8794.